JPS5916760Y2 - instant water heater - Google Patents

Description

[Detailed description of the invention] The present invention consists of a gas burner capacity switch and a temperature control valve (hereinafter referred to as a temperature control valve) in an instantaneous water heater.

) is related to the interlocking structure.

Conventionally, gas burner capacity switching has been carried out in order to adjust the hot water supply temperature due to seasonal differences in inlet water temperature, and to obtain hot water at different flow rates at the same temperature for economical use.

However, when switching to a small gas burner capacity, if the flow rate adjustment range of the temperature control valve that regulates the amount of water supplied to the heat exchanger is the same as when the gas burner has a high capacity, the hot water supply temperature will drop significantly at the maximum flow position due to insufficient burner capacity. When the temperature becomes low, or conversely when switching from a small capacity to a large capacity, if the temperature control valve is at the minimum flow position, the burner capacity will reach its maximum and boiling will occur, making temperature control extremely difficult.

The present invention takes the above problems into account, and automatically shifts the flow rate adjustment range to the low flow rate side when changing the gas burner's small capacity.
The purpose of this water heater is to provide a water heater that can easily adjust the water temperature by regulating the water temperature so that it will not be adjusted to a temperature outside the set range at both high capacity and low capacity. This will be explained in detail based on the example shown.

1 is a waterway in which a water stop valve 2, a temperature control valve 3, a heat exchanger 4, a hot water tap 5, and a shower/serpentine pipe switching valve 6 are installed in order from the upstream side.

7 is a hydraulic response device that opens and closes a gas valve 9 arranged in a gas path leading to a gas burner 8, and a diaphragm 10 in the device
The high pressure chamber 11, which is divided into two, communicates with the water channel 1 on the upstream side of the temperature control valve 3, and the low pressure chamber 12 communicates with the water channel 1 through an orifice 13 provided in the water channel 1 downstream of the temperature control valve 3.

Further, the gas passage 14 downstream of the gas valve 9 is branched, one branch gas passage 15 is connected to one of the two gas burners 8, and the other branch gas passage 16 is connected to the other side of the gas burner 8 through a normally open capacity switching valve 17. It is connected to the.

18 is an opening/closing shaft of the capacity switching valve 17.

Further, the temperature control valve 3 is provided with a hollow valve body 22 having an end face opening 20 as a water inlet in the valve chamber 19 and a water outlet 21 with a continuously reduced opening area on the peripheral wall. A cylindrical body 23 is rotatably disposed surrounding the cylindrical body 23, and a stopper 25 embedded in the operating shaft 24 of the temperature control valve 3 is attached to the cylindrical body 23 within a range of approximately 180°.
A rotation guide groove 26 for a fixed stopper 27 attached to another member is provided, and a rotation guide groove 28 for a fixed stopper 27 attached to another member is provided in an approximately 90° range.

Reference numeral 29 is a lever that connects the opening/closing shaft 18 and the cylindrical body 23.

The present invention has the above configuration, and the hot water temperature is controlled by the operation shaft 24.
By rotating the valve body 22, the opening area of the water outlet 21 of the valve body 22 changes, and the amount of water flowing to the heat exchanger 4 can be increased or decreased to obtain an arbitrary temperature.

However, when the opening/closing shaft 18 is rotated to close the capacity switching valve 17 and reduce the capacity of the gas burner 8, the rotational force of the opening/closing shaft 18 is transmitted to the cylinder body 23 by the interlocking lever 29.

The cylindrical body 23 rotates approximately 90' around the valve chamber 19 by means of the fixed stud I/flange 27 and the guide groove 2ε.

At this time, as the cylinder body 23 rotates, the guide groove 26 also moves approximately 90 degrees, and the flow rate adjustment range of the temperature control valve 3 automatically shifts to a lower flow rate side than usual.

That is, as shown in FIGS. 3 and 4, when the gas burner is at high capacity, the opening area of the water outlet 21 of the valve body 22, which corresponds to the movement range of the stopper 25 of the guide groove 26, can be changed from A to C. On the other hand, when the gas burner has a small capacity, the water outlet 2
The opening area of No. 1 changes from B to D, and the flow rate adjustment range of the valve for temperature control at low capacity shifts to the low flow rate side as a whole.

According to this invention, the hot water temperature will not be adjusted to a significantly lower temperature when changing the gas burner's small capacity.
On the other hand, since the flow rate adjustment range at high capacity returns to the high flow side compared to when low capacity, boiling due to excessive burner capacity can be prevented, making it easy to adjust the water temperature at each capacity, making it extremely Thus, a useful instantaneous water heater can be provided.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing the embodiment, Fig. 2 is a sectional view of the main parts, Figs. FIG. 4 shows the state at low capacity. FIG. 5 is a developed view of the temperature control valve body. 3...Temperature control valve, 4...Heat exchanger,
7...Hydraulic response device, 14...Gas passage, 17...Capacity switching valve, 18...Opening/closing shaft, 24...Operation shaft.

Claims (1)

[Scope of utility model registration request] By associating the opening/closing shaft of a manual capacity switching valve arranged in the gas path leading to the gas burner with a cylindrical body regulating the rotation range of the stopper provided on the operating shaft of the manual temperature control valve arranged in the waterway, An instantaneous water heater characterized in that the flow rate adjustment range of the temperature control valve is shifted to the low flow rate side when the capacity is small and to the high capacity side when the capacity is large.